US Patent 7419292 Illuminating device

Patent 7419292 was granted and assigned to Seiko Epson on September, 2008 by the United States Patent and Trademark Office.

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Is a

Patent

Patent attributes

Current Assignee

Seiko Epson

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

7419292

Date of Patent

September 2, 2008

Patent Application Number

11330872

Date Filed

January 12, 2006

Patent Primary Examiner

‌

Sandra O'Shea

Patent abstract

An illuminating device includes a light source, an optical waveguide that emits light from the light source through an emission surface thereof, and a prism sheet that is provided on the emission surface side of the optical waveguide. In the illuminating device, the following relationship is established between a refractive index x of the prism sheet and an apex angle y of a prism: y=107.86x−140.43+M (−4≦M≦4).